Method for manufacturing high-voltage solid-electrolyte aluminum electrolytic capacitor

ABSTRACT

The present invention discloses a method for manufacturing a high-voltage solid electrolyte aluminum-electrolytic capacitor, including: (1) Welding a capacitor core onto an iron bar, applying a voltage for chemical treatment, and after the chemical treatment, washing and drying the capacitor core; (2) impregnating the dried capacitor core in a dispersion A for 1˜30 minutes; (3) removing the capacitor core out of the dispersion A, creating a vacuum and then impregnating the capacitor core in the dispersion A for 1˜10 minutes; (4) keeping the capacitor core in the dispersion A, breaking the vacuum and then performing pressurization, and keeping the pressurized state for 1˜10 minutes; (5) keeping the capacitor core in the dispersion A, performing depressurization to an atmospheric pressure, and keeping the atmospheric pressure for 1˜10 minutes; (6) taking the capacitor core out, placing the capacitor core in a temperature of 65˜100° C. and drying it for 20˜60 minutes, and then placing the capacitor core in a temperature of 135˜165° C. and drying it for 20˜60 minutes; (7) repeating steps (3) to (6) at least once; and (8) putting the capacitor core in an aluminum cover and sealing it, and performing aging treatment, where the dispersion A is a dispersion that includes conductive polymers. This manufacturing method may be performed to obtain a solid capacitor of a lower ESR value and a higher withstand voltage, and obtain a lower leakage current.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a national phase entry under 35 U.S.C. § 371of International Application No. PCT/CN2015/073531, filed Mar. 3, 2015,which claims priority from Chinese Patent Application No. 201510064074.6filed Feb. 6, 2015, all of which are hereby incorporated herein byreference.

TECHNICAL FIELD

The present invention relates to the technical field of preparing anelectrolytic capacitor, and in particular, to a method for manufacturinga high-voltage solid electrolyte aluminum-electrolytic capacitor.

BACKGROUND

Compared with an tranditional liquid electrolytic capacitor, a solidelectrolytic capacitor has advantages such as prominent electricalperformance, a low equivalent series resistance (ESR), a highlyripple-tolerant current, a long life, and stable performance. Continualupgrading of electronic products brings higher functionality andperformance and also imposes higher requirements on high-frequencycharacteristics of the capacitor. People reduce the ESR of the solidelectrolytic capacitor by different means to satisfy the high-frequencycharacteristics of the capacitor.

However, although the solid capacitor has its irreplaceable advantages,the current state of the art has two main problems. One problem is thatthe voltage of a product cannot be too high and could not be as high as35V, and the other problem is that the leakage current of the product ishigh enough to exceed 0.05 CV. Reasons for such problems are: During theprocess of manufacturing a solid capacitor, monomers and oxidants aregenerally dissolved by using a solvent, and enter a capacitor core bymeans of impregnating, and then are polymerized under specificconditions to generate a conductive solid electrolyte. Thismanufacturing process has two disadvantages. One disadvantage is thatthe oxidant itself is highly acidic and strongly damages the oxidiationfilm of the positive electrode foil, thereby significantly reducing theoriginal voltage value of the positive electrode foil. The otherdisadvantage is that the monomers and the oxidant are dissolved in thesolvent and infiltrate the capacitor core, and as the positive electrodefoil is well impregnated in the solvent, the oxidant and the monomersare brought into etched pores of the anodized foil. The pores, where theoxide film is generated in the chemical treatment process, are fragile,plus the solid electrolyte is not repairable, hence, the withstandvoltage of the pores is low. When a specific voltage is applied, a highleakage current is generated and leads to failure of the product.

A technical solution to this problem is to polymerize a conductivepolymer in water to form a water dispersion, and then the conductivepolymer infiltrates the capacitor core by impregnating. A capacitorformed in this way prevents the oxidant from impairing the foil, so thatthe withstand voltage of the product is higher. In addition, moleculesof the polymer dispersed in the water have a specific size. Because thepolymer is dispersed in the water and the water generally provides alower impregnation effect than the solvent, it is ensured that theconductive polymer infiltrates the pores of the positive electrode foil.Due to the presence of polymers, the fragile pores with a low withstandvoltage prevent substantial electric leakage, so that the withstandvoltage of the product is much higher.

In the current state-of-the-art, because an ordinary impregnation manneris applied without considering the low impregnation effect of water, thecapacitance withdrawing rate of the product is low, it is difficult tomake a product of a larger size, for example, larger than Φ10*12 mm, orproduct consistency is low.

SUMMARY

To overcome disadvantages in the prior art, the present inventionprovides a method for manufacturing a high-voltage solid electrolytecapacitor. This method implements thorough impregnation of a capacitorcore by impregnating the capacitor core under different pressureconditions. By repeating steps, it is ensured that many polymers existin impregnated areas and are evenly distributed to obtain stableconductive polymers. Especially this method is indispensible for makinga product of a larger size, for example, larger than Φ10*12 mm. Thismanufacturing method may be performed to obtain a solid capacitor of alower ESR value and a higher withstand voltage, obtain a lower leakagecurrent, and obtain better batch consistency.

The following technical solutions of the present invention are used toresolve the foregoing technical problems:

The present invention provides a method for manufacturing a high-voltagesolid electrolyte aluminum-electrolytic capacitor, including:

(1) welding a capacitor core of a capacitor onto an iron bar, applying avoltage for chemical treatment, and after the chemical treatment,washing and drying the capacitor core;

(2) impregnating the dried capacitor core in a dispersion A for 1˜30minutes;

(3) removing the capacitor core out of the dispersion A, creating avacuum and then impregnating the capacitor core in the dispersion A for1˜10 minutes;

(4) keeping the capacitor core in the dispersion A, breaking the vacuumand then performing pressurization, and keeping the pressurized statefor 1˜10 minutes;

(5) keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure, and keeping the atmosphericpressure for 1˜10 minutes;

(6) taking the capacitor core out, placing the capacitor core in atemperature of 65˜100° C. and drying it for 20˜60 minutes, and thenplacing the capacitor core in a temperature of 135˜165° C. and drying itfor 20˜60 minutes;

(7) repeating steps (3) to (6) at least once; and

(8) putting the capacitor core in an aluminum cover and sealing it, andperforming aging treatment to obtain a high-voltage solid electrolytealuminum-electrolytic capacitor.

The dispersion A is a dispersion that includes conductive polymers.

Further, the vacuum degree of the vacuum created in step (3) is 700˜970Pa.

Further, the pressurizing in step (4) refers to feeding compressed airuntil 0.1˜0.6 MPa.

Further, step (7) is to repeat steps (3) to (6) five times.

Further, step (7) is to repeat steps (3) to (6) ten times.

Further, the conductive polymers are poly (3,4-ethylene dioxythiophene).

Further, the capacitor core in step (2) is formed by winding Asahi KaselADS040060 electrolytic paper between a JCC anodized foil and a Nanofoilcathode foil.

Further, the manufacturing method includes:

(1) welding a capacitor core of a capacitor onto an iron bar, applying avoltage for chemical treatment, and after the chemical treatment,washing and drying the capacitor core;

(2) impregnating the dried capacitor core in a dispersion A for 15minutes;

(3) removing the capacitor core out of the dispersion A, creating avacuum to reach an 850 Pa vacuum state and then impregnating thecapacitor core in the dispersion A for 5 minutes;

(4) keeping the capacitor core in the dispersion A, breaking the vacuumand then feeding compressed air until 0.5 MPa, and keeping thepressurized state for 5 minutes;

(5) keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure state, and keeping theatmospheric pressure state for 5 minutes;

(6) taking the capacitor core out, placing the capacitor core in a lowtemperature of 85° C. and drying it for 60 minutes, then placing thecapacitor core in a high temperature of 150° C. and drying it for 30minutes, and taking the capacitor core out;

(7) repeating steps (3) to (6) five times; and

(8) putting the capacitor core in an aluminum cover and sealing it, andperforming aging treatment to obtain a high-voltage solid electrolytealuminum-electrolytic capacitor.

The dispersion A is a dispersion that includes conductive polymers.

Further, the drying in step (1) is specifically: Drying the capacitorcore in a low temperature of 50˜100° C. for 20˜100 minutes first, andthen drying it in a high temperature of 110˜200° C. for 20˜60 minutes.

Compared with the prior art, the present invention brings the followingbeneficial effects:

(1) In the present invention, when the capacitor core is impregnated inthe dispersion under multiple pressure conditions such as atmosphericpressure, vacuum and pressurization, the electrolyte in the dispersioncan more sufficiently generate a stable conductive polymer layer on thesurface of the foil, thereby improving electrical performance of thecapacitor. In addition, as a solid electrolyte, the polymer dispersioncan effectively increase the withstand voltage of the solid electrolytealuminum-electrolytic capacitor.

(2) In the present invention, the impregnation steps are repeated manytimes, and by means of heat treatment, an impregnating solvent isremoved out of the capacitor core, which is conducive to absorption ofan impregnating fluid in next impregnation. In this way, a high-voltagesolid electrolyte aluminum-electrolytic capacitor of a lower ESR valuecan be obtained, the capacitance withdrawing rate is improved, andproduct consistency is improved while loss is reduced.

DESCRIPTION OF EMBODIMENTS

The following clearly and comprehensively describes the technicalsolutions of the present invention with reference to embodiments of thepresent invention. Apparently, the described embodiments are merely partbut not all of the embodiments of the present invention. All otherembodiments obtained by a person of ordinary skill in the art based onthe embodiments of the present invention without creative efforts shallfall within the protection scope of the present invention.

The present invention provides a solid electrolyte aluminum-electrolyticcapacitor, including an aluminum cover and a capacitor core disposed inthe aluminum cover. The capacitor core is connected to a positiveelectrode terminal and a negative electrode terminal, and outer surfacesof the positive electrode terminal and the negative electrode terminalare coated with a silver plating layer. A rubber cover or a rubber plugis disposed above the capacitor core. The capacitor core includes ananodized aluminum foil, a cathode foil, and electrolytic paper and asolid electrolyte between the anodized aluminum foil and the cathodefoil. The solid electrolyte may be a conductive polymer, or may be acomposite material that combines a conductive polymer and a conductivecarbon material. The solid electrolyte is a result of polymerizing byimpregnating in the conductive polymer and/or a conductive carbonmaterial dispersion.

Preferably but not restrictively, the anodized aluminum foil is a JCCanodized foil manufactured by Japan Capacitor Industrial Co., Ltd, themodel of the anodized aluminum foil is HGF110J16˜365VF-1.33 μF, and itis 17 mm in width and 491 mm in length; the cathode foil is a Nanofoilcathode foil, the model of the cathode foil is NF3000, and it is 17 mmin width and 521 mm in length; and the electrolytic paper is Asahi KaselDS040060 that is 20 mm in width.

Preferably but not restrictively, the solid electrolyte may be aconductive polymer, or may be a physical mixture or composition of aconductive polymer and a conductive carbon material. The conductivepolymer and the conductive carbon material may be mixed into the solidelectrolyte, or the conductive polymer and the conductive carbonmaterial are laminated into the solid electrolyte, but the presentinvention is not limited thereto.

A dispersion A and a dispersion C used in the present invention arerespectively a dispersion inclusive of a conductive polymer and adispersion inclusive of a conductive carbon material; and a dispersion Bis a dispersion inclusive of both a conductive polymer and a conductivecarbon material.

Preferably but not restrictively, the conductive polymer is polyanilineand/or polypyrrole and/or polythiophene and/or poly (3,4-ethylenedioxythiophene). For a method for preparing the conductive polymerdispersion, that is, the dispersion A, refer to Chinese patent CN101309949B, and the method is not described herein in detail. Aconcentration of the conductive polymer is preferably but not limited to2˜3% (a weight percentage).

Preferably but not restrictively, the conductive carbon material is acarbon nanomaterial or a carbon nanocomposite. With respect to the sizeof the conductive carbon material, a graphene particle size ispreferably less than 200 nm, and a carbon nanotube length is 2˜200 nm.The carbon nanomaterial is a carbon nanotube or graphene; and an activematerial in the carbon nanocomposite is one or more of the following: aconductive polymer, a metal oxide, a mixture of conductive polymers, amixture of a conductive polymer and a metal oxide, a mixture of metaloxides, a composite of conductive polymers, a composite of a conductivepolymer and a metal oxide, and a composite of metal oxides.

Preferably but not restrictively, an ethanol solution is placed in ahigh-speed shearing machine that shears at a speed of 20000 rpm. Thegraphene or carbon nanotube or carbon nanocomposite is slowly added intoan alcohol solution that is being stirred. The stirring time iscontrolled to be at least 30 minutes, so that a dispersion inclusive ofthe conductive carbon material, that is, the dispersion C, is prepared.The concentration of the alcohol dispersion inclusive of the conductivecarbon material is controlled to be 0.5˜5% (a weight percentage), and aproper amount of a dispersing agent such as sodium dodecyl sulfate (SDS)or sodium dodecylbenzenesulfonate (SDBS) may be added in the dispersion.

Preferably but not restrictively, an ethanol solution is placed in ahigh-speed shearing machine that shears at a speed of 20000 rpm. Thegraphene or carbon nanotube or carbon nanocomposite is slowly added intoan alcohol solution that is being stirred. The concentration of theconductive carbon material is controlled to be 0.5˜5% (a weightpercentage). Then a conductive polymer is added, whose concentration maybe controlled to be 2˜3% (a weight percentage). The stirring time iscontrolled to be at least 30 minutes, so that a dispersion inclusive ofthe conductive carbon material and the conductive polymer, that is, thedispersion B, is prepared. In addition, a proper amount of a dispersingagent such as sodium dodecyl sulfate (SDS) or sodiumdodecylbenzenesulfonate (SDBS) may be added.

The present invention provides a method for manufacturing a solidelectrolyte aluminum-electrolytic capacitor, in which a solidelectrolyte is a conductive polymer. The manufacturing methodspecifically includes the following steps:

(1) Winding electrolytic paper between an anodized aluminum foil and acathode foil into a capacitor core, welding an anode of the capacitorcore onto an iron bar, and impregnating the capacitor core in a formingagent. According to a voltage of a positive foil, applying a specificvoltage for at least 20 minutes, where the forming agent may be aphosphoric acid forming agent, a boric acid forming agent or an ammoniumadipate forming agent.

After the chemical treatment, impregnating the capacitor core in 40˜100°C. pure water for 30˜60 minutes, removing residual ingredients in theforming agent, and then drying. The drying includes two steps. The firststep is low-temperature drying, in which the temperature for drying iscontrolled within 50˜100° C. If the temperature is too low, the effectof drying is degraded; if the temperature for drying is higher than 100°C., liquid may boil in the product, which affects product features. Thedrying time continues for 20˜100 minutes to prevent enough water forboiling in the capacitor core. The temperature for drying in the secondstep is 110˜200° C. to ensure full volatilization of residual moisture.Too high temperature should be avoided because they may damage a leadelectrode and tin melting. The drying time continues for 20˜60 minutes.If the drying time is too short, residual moisture may remain, which mayaffect next impregnation and product features. If the drying time is toolong, an anodized foil of the product may be degraded, which affectsproduct performance.

(2) Impregnating the dried capacitor core in a dispersion A for 1˜30minutes.

(3) Removing the capacitor core out of the dispersion A, creating avacuum for the capacitor core and the dispersion A together to reach a700˜970 Pa vacuum state and then impregnating the capacitor core in thedispersion A for 1˜10 minutes.

(4) Keeping the capacitor core in the dispersion A, breaking the vacuumand then feeding compressed air for pressurization until 0.1˜0.6 MPa,and keeping the pressurized state for 1˜10 minutes.

(5) Keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure state, and keeping theatmospheric pressure state for 1˜10 minutes.

(6) Taking the capacitor core out, placing the capacitor core in atemperature of 50˜100° C. and drying it for 20˜60 minutes (preferablybut not limited to 85° C.), then placing the capacitor core in atemperature of 110˜200° C. and drying it for 20˜60 minutes (preferablybut not limited to 150° C.), and taking the capacitor core out.

(7) Repeating steps (3) to (6) at least once, preferably but not limitedto five times. With little solid content of polymers included in thedispersion A, few polymers are adsorbed onto the capacitor core if thecapacitor core is impregnated only once, which may affect productconsistency, slightly increase the ESR, and increase the loss. If thesolid content is too low, the product life is hardly ensured. Theimpregnation may be performed repeatedly according to actual needs.

(8) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor. An agingmethod is: Placing the capacitor in an 85˜150° C. environment, applyinga 0.2× rated voltage for 20˜100 minutes, then applying a 0.5× ratedvoltage for 20˜100 minutes, then applying a 0.8× rated voltage for20˜100 minutes, then applying a 1.0× rated voltage for 20˜100 minutes,and then applying a 1.2× rated voltage for 20˜100 minutes.

The present invention provides another method for manufacturing a solidelectrolyte aluminum-electrolytic capacitor, in which a solidelectrolyte is a conductive polymer and a conductive carbon material.The manufacturing method specifically includes the following steps:

(1) Winding electrolytic paper between an anodized aluminum foil and acathode foil into a capacitor core, welding an anode of the capacitorcore onto an iron bar, and impregnating the capacitor core in a formingagent. According to a voltage of a positive foil, applying a specificvoltage for at least 20 minutes. After the chemical treatment,impregnating the capacitor core in 40˜100° C. pure water for 30˜60minutes, removing residual ingredients in the forming agent, then dryingthe capacitor core in a low temperature of 50˜400° C. for 20˜100minutes, and then drying it in a high temperature of 110˜200° C. for20˜60 minutes.

(2) Impregnating the dried capacitor core in a dispersion B for 1˜30minutes.

(3) Removing the capacitor core out of the dispersion B, creating avacuum for the capacitor core and the dispersion together to reach a700˜970 Pa vacuum state and then impregnating the capacitor core in thedispersion B for 1˜10 minutes.

(4) Keeping the capacitor core in the dispersion B, breaking the vacuumand then feeding compressed air for pressurization until 0.1˜0.6 MPa,and keeping the pressurized state for 1˜10 minutes.

(5) Keeping the capacitor core in the dispersion B, performingdepressurization to an atmospheric pressure state, and keeping theatmospheric pressure state for 1˜10 minutes.

(6) Taking the capacitor core out, placing the capacitor core in a hightemperature of 50˜100° C. and drying it for 20˜60 minutes (preferablybut not limited to 85° C.), then placing the capacitor core in atemperature of 110˜200° C. and drying it for 20˜60 minutes (preferablybut not limited to 150° C.), and taking the capacitor core out.

(7) Repeating steps (3) to (6) at least once, preferably but not limitedto five times.

(8) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor.

The present invention further provides a method for manufacturing asolid electrolyte aluminum-electrolytic capacitor, in which a solidelectrolyte is a conductive polymer and a conductive carbon material.The manufacturing method specifically includes the following steps:

(1) Winding electrolytic paper between an anodized aluminum foil and acathode foil into a capacitor core, welding an anode of the capacitorcore onto an iron bar, and impregnating the capacitor core in a formingagent. According to a voltage of a positive foil, applying a specificvoltage for at least 20 minutes. After the chemical treatment,impregnating the capacitor core in 40˜100° C. pure water for 30˜60minutes, removing residual ingredients in the forming agent, then dryingthe capacitor core in a low temperature of 50˜100° C. for 20˜100minutes, and then drying it in a high temperature of 110˜200° C. for20˜60 minutes.

(2) Impregnating the dried capacitor core in a dispersion A for 1˜30minutes.

(3) Removing the capacitor core out of the dispersion A, creating avacuum and then impregnating the capacitor core in the dispersion A for1˜10 minutes.

(4) Keeping the capacitor core in the dispersion A, breaking the vacuumand then performing pressurization, and keeping the pressurized statefor 1˜10 minutes.

(5) Keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure, and keeping the atmosphericpressure for 1˜10 minutes.

(6) Taking the capacitor core out, placing the capacitor core in atemperature of 65˜100° C. and drying it for 20˜60 minutes, and thenplacing the capacitor core in a temperature of 135˜165° C. and drying itfor 20˜60 minutes.

(7) Impregnating the dried capacitor core in a dispersion C for 1˜30minutes.

(8) Taking the capacitor core out, placing the capacitor core in atemperature of 65˜100° C. and drying it for 20˜60 minutes, and thenplacing the capacitor core in a temperature of 135˜165° C. and drying itfor 20˜60 minutes.

(9) Repeating steps (3) to (8) at least once.

(10) Putting the capacitor core in an aluminum cover and sealing it, andperforming aging treatment to obtain a solid electrolytealuminum-electrolytic capacitor.

The present invention still further provides a method for manufacturinga solid electrolyte aluminum-electrolytic capacitor, in which a solidelectrolyte is a conductive polymer and a conductive carbon material.The manufacturing method specifically includes the following steps:

(1) Winding electrolytic paper between an anodized aluminum foil and acathode foil into a capacitor core, welding an anode of the capacitorcore onto an iron bar, and impregnating the capacitor core in a formingagent. According to a voltage of a positive foil, applying a specificvoltage for at least 20 minutes. After the chemical treatment,impregnating the capacitor core in 40˜100° C. pure water for 30˜60minutes, removing residual ingredients in the forming agent, then dryingthe capacitor core in a low temperature of 50˜100° C. for 20˜100minutes, and then drying it in a high temperature of 110˜200° C. for20˜60 minutes.

(2) Impregnating the dried capacitor core in a dispersion B for 1˜30minutes.

(3) Removing the capacitor core out of the dispersion B, creating avacuum and then impregnating the capacitor core in the dispersion B for1˜10 minutes.

(4) Keeping the capacitor core in the dispersion B, breaking the vacuumand then performing pressurization, and keeping the pressurized statefor 1˜10 minutes.

(5) Keeping the capacitor core in the dispersion B, performingdepressurization to an atmospheric pressure, and keeping the atmosphericpressure for 1˜10 minutes.

(6) Taking the capacitor core out, placing the capacitor core in atemperature of 65˜100° C. and drying it for 20˜60 minutes, and thenplacing the capacitor core in a temperature of 135˜165° C. and drying itfor 20˜60 minutes.

(7) Impregnating the dried capacitor core in a dispersion C for 1˜30minutes.

(8) Taking the capacitor core out, placing the capacitor core in atemperature of 65˜100° C. and drying it for 20˜60 minutes, and thenplacing the capacitor core in a temperature of 135˜165° C. and drying itfor 20˜60 minutes.

(9) Repeating steps (3) to (8) at least once.

(10) Putting the capacitor core in an aluminum cover and sealing it, andperforming aging treatment to obtain a solid electrolytealuminum-electrolytic capacitor.

The vacuum state and the pressurized state mentioned in the presentinvention may be implemented on one device or on two different devices,but preferably, on one device. The capacitor core and the dispersion aresimultaneously in the vacuum state or atmospheric pressure state orpressurized state.

The manufacturing method is applicable not only to a high-voltage solidelectrolyte aluminum-electrolytic capacitor but also to a solidelectrolyte capacitor of tantalum, niobium, titanium, or the like.

The following gives detailed description with reference to specificembodiments.

Embodiment 1

A conductive polymer of a dispersion A used in this embodiment is poly(3,4-ethylene dioxythiophene) with a particle size of about 40 to 80 nm,preferably 60 nm. Specifications of capacitors are 200V100 μF, and thesize of the capacitors is Φ16*26 mm. A method for manufacturing thecapacitors is as follows:

(1) Using a JCC anodized foil (manufactured by Japan CapacitorIndustrial Co., Ltd), whose model is HGF110J16˜365VF-1.33 μF, where theJCC anodized foil is 17 mm in width and 491 mm in length; using aNanofoil cathode foil whose model is NF3000, where the Nanofoil cathodefoil is 17 mm in width and 521 mm in length; and electrolytic paper isAsahi Kasel ADS040060 that is 20 mm in width. Winding the electrolyticpaper between the anodized foil and the cathode foil into a capacitorcore, welding an anode of the capacitor core onto an iron bar, andimpregnating the capacitor core in a forming agent. According to avoltage of a positive foil, applying a 365V voltage in a phosphoric acidforming agent for 20 minutes. After the chemical treatment, impregnatingthe capacitor core in 70° C. pure water for 30 minutes to removeresidual ingredients in the forming agent, then drying the capacitorcore in a low temperature of 75° C. for 60 minutes, and then drying itin a high temperature of 150° C. for 30 minutes.

(2) Impregnating the dried capacitor core in a dispersion A for 15minutes.

(3) Removing the capacitor core out of the dispersion A, creating avacuum to reach an 850 Pa vacuum state and then impregnating thecapacitor core in the dispersion A for 5 minutes.

(4) Taking the capacitor core out, placing the capacitor core in a lowtemperature of 85° C. and drying it for 60 minutes, then placing thecapacitor core in a high temperature of 150° C. and drying it for 30minutes, and taking the capacitor core out.

(5) Repeating steps (3) to (4) five times.

(6) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor. An agingmethod is: Placing the product in a 110° C. environment, applying a 0.2×rated voltage for 80 minutes, then applying a 0.5× rated voltage for 60minutes, then applying a 0.8× rated voltage for 40 minutes, thenapplying a 1.0× rated voltage for 20 minutes, and then applying a 1.2×rated voltage for 20 minutes.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 1.

TABLE 1 Performance test for capacitors manufactured in Embodiment 1Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 94.04 4.0316.70 14.40 2 93.35 3.20 16.50 12.80 3 93.28 3.16 18.20 24.10 4 92.423.94 17.30 12.00 5 92.40 4.02 18.00 8.90 6 91.82 4.56 16.90 7.00 7 92.723.73 16.50 7.00 8 94.32 3.57 16.80 33.30 9 92.95 3.71 16.70 5.30 1091.99 3.44 17.20 8.10 11 92.03 3.56 17.10 14.00 12 91.97 5.17 18.1012.20 13 92.86 3.69 17.00 29.40 14 92.77 3.94 17.80 9.60 15 91.49 5.2218.80 8.00 16 93.54 3.38 17.70 8.90 17 93.73 3.82 18.60 7.00 18 93.403.41 17.40 13.00 19 93.27 3.23 16.90 6.70 20 95.17 3.42 17.60 5.00 MIN91.49 3.16 16.50 5.00 MAX 95.17 5.22 18.80 33.30 AVE 92.98 3.81 17.3912.34

Embodiment 2

Similar to Embodiment 1, this embodiment intends to manufacture 20capacitors and analyze them, in which specifications of the capacitorsare 200V100 μF and the size of the capacitors is Φ16*26 mm. A differencebetween the manufacturing method in Embodiment 1 and this embodiment is:Step (3): Keeping the capacitor core in the dispersion A, feedingcompressed air until 0.5 MPa, and keeping the pressurized state for 5minutes. Other steps and the implementation order remain the same. Ananalysis result is shown in Table 2.

TABLE 2 Performance test for capacitors manufactured in Embodiment 2Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 93.82 3.5117.30 18.00 2 93.99 3.85 18.40 15.00 3 94.23 3.45 15.60 33.00 4 93.843.77 16.50 15.00 5 94.98 3.85 17.10 13.00 6 93.68 3.11 17.60 10.00 794.31 3.50 16.50 10.00 8 91.48 4.93 17.40 7.00 9 92.90 4.28 15.80 8.0010 92.51 3.41 16.30 6.00 11 94.91 3.20 16.50 20.00 12 93.43 3.58 17.407.00 13 92.65 3.05 16.20 14.00 14 91.21 3.40 16.40 12.00 15 93.98 3.7116.90 4.00 16 94.36 3.29 16.80 9.00 17 93.96 4.01 16.90 8.00 18 92.823.09 18.50 8.00 19 93.13 3.07 17.50 7.00 20 92.47 3.16 17.80 11.00 MIN91.21 3.05 15.60 4.00 MAX 94.98 4.93 18.50 33.00 AVE 93.43 3.56 16.9711.75

Embodiment 3

Similar to Embodiment 1, this embodiment intends to manufacture 20capacitors and analyze them, in which specifications of the capacitorsare 200V100 μF and the size of the capacitors is Φ16*26 mm. A differencebetween the manufacturing method in Embodiment 1 and this embodiment isthat an atmospheric pressure impregnation step is added between step (3)and step (4). The atmospheric pressure impregnation step isspecifically: Keeping the capacitor core in the dispersion A, breakingthe vacuum until an atmospheric pressure state, and keeping thepressurized state for 5 minutes. Other steps remain unchanged. Ananalysis result is shown in Table 3.

TABLE 3 Performance test for capacitors manufactured in Embodiment 3Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 96.16 2.8714.50 56.00 2 97.58 3.22 14.30 31.70 3 94.38 2.97 13.80 17.30 4 96.032.90 14.30 15.00 5 94.05 2.87 15.20 13.30 6 97.31 3.37 13.20 12.80 797.49 2.87 14.70 11.10 8 97.45 2.90 13.30 9.00 9 97.59 2.81 15.80 9.8010 95.68 2.92 13.60 9.00 11 96.89 2.83 14.10 32.00 12 97.52 2.93 13.6020.20 13 97.60 3.23 13.20 30.00 14 96.80 2.77 14.40 15.60 15 95.52 3.0613.80 12.00 16 96.96 3.11 13.70 13.30 17 97.55 2.98 13.90 14.00 18 95.942.94 14.24 9.20 19 97.48 3.97 15.66 9.00 20 98.08 2.97 13.05 8.30 MIN94.05 2.77 13.05 8.30 MAX 98.08 3.97 15.80 56.00 AVE 96.70 3.02 14.1217.43

Embodiment 4

Similar to Embodiment 2, this embodiment intends to manufacture 20capacitors and analyze them, in which specifications of the capacitorsare 200V100 μF and the size of the capacitors is Φ16*26 mm. A differencebetween the manufacturing method in Embodiment 2 and this embodiment isthat an atmospheric pressure impregnation step is added between step (3)and step (4). The atmospheric pressure impregnation step isspecifically: Keeping the capacitor core in the dispersion A, performingpressurization to an atmospheric pressure state, and keeping thepressurized state for 5 minutes. Other steps remain unchanged. Ananalysis result is shown in Table 4.

TABLE 4 Performance test for capacitors manufactured in Embodiment 4Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 99.88 2.3013.70 23.00 2 99.22 2.43 14.20 25.30 3 99.80 2.47 12.40 23.20 4 99.082.68 12.60 15.60 5 98.86 2.42 14.50 13.00 6 98.52 2.97 12.80 20.00 798.59 2.82 13.70 25.60 8 99.18 2.62 13.40 17.40 9 99.13 2.69 12.60 25.0010 98.95 2.23 13.80 16.90 11 99.17 2.85 13.20 20.00 12 98.64 2.74 13.5017.60 13 98.46 2.59 13.30 14.30 14 99.30 2.97 13.40 12.00 15 99.66 2.9912.90 11.00 16 99.14 2.69 12.50 19.90 17 98.51 2.73 12.90 18.00 18 98.732.66 13.10 18.70 19 98.44 3.01 12.70 17.00 20 97.94 2.19 14.10 11.00 MIN97.94 2.19 12.40 11.00 MAX 99.88 3.01 14.50 25.60 AVE 98.96 2.65 13.2718.23

Embodiment 5

A method for manufacturing capacitors is as follows:

(1) Using a JCC anodized foil whose model is HGF110J16˜365VF-1.33 μF,where the JCC anodized foil is 17 mm in width and 491 mm in length;using a Nanofoil cathode foil whose model is NF3000, where the Nanofoilcathode foil is 17 mm in width and 521 mm in length; and electrolyticpaper is Asahi Kasel ADS040060 that is 20 mm in width. Specifications ofmanufactured capacitors are 200V100 and the size of the capacitors isΦ16*26 mm. Winding the electrolytic paper between the anodized foil andthe cathode foil into a capacitor core, welding an anode of thecapacitor core onto an iron bar, and impregnating the capacitor core ina forming agent. According to a voltage of a positive foil, applying a365V voltage in a phosphoric acid forming agent for 20 minutes. Afterthe chemical treatment, impregnating the capacitor core in 70° C. purewater for 30 minutes to remove residual ingredients in the formingagent, then drying the capacitor core in a low temperature of 75° C. for60 minutes, and then drying it in a high temperature of 150° C. for 30minutes.

(2) Impregnating the dried capacitor core in a dispersion A for 15minutes.

(3) Removing the capacitor core out of the dispersion A, creating avacuum to reach an 850 Pa vacuum state and then impregnating thecapacitor core in the dispersion A for 5 minutes.

(4) Keeping the capacitor core in the dispersion A, breaking the vacuumand then feeding compressed air until 0.5 MPa, and keeping thepressurized state for 5 minutes.

(5) Keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure state, and keeping theatmospheric pressure state for 5 minutes.

(6) Taking the capacitor core out, placing the capacitor core in a lowtemperature of 85° C. and drying it for 60 minutes, then placing thecapacitor core in a high temperature of 150° C. and drying it for 30minutes, and taking the capacitor core out.

(7) Repeating steps (3) to (6) five times.

(8) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor. An agingmethod is: Placing the product in a 110° C. environment, applying a 0.2×rated voltage for 80 minutes, then applying a 0.5× rated voltage for 60minutes, then applying a 0.8× rated voltage for 40 minutes, thenapplying a 1.0× rated voltage for 20 minutes, and then applying a 1.2×rated voltage for 20 minutes.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 5.

TABLE 5 Performance test for capacitors manufactured in Embodiment 5Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 101.04 2.2712.90 20.00 2 100.38 2.40 12.90 20.70 3 100.69 2.46 12.50 23.20 4 101.292.36 12.60 24.60 5 101.21 2.60 12.70 22.00 6 99.05 2.37 12.80 17.40 7101.21 2.51 12.70 16.00 8 101.37 2.38 13.40 18.10 9 101.57 2.36 12.6019.90 10 100.80 2.41 13.20 18.10 11 101.82 2.24 13.10 22.20 12 102.042.46 12.90 18.00 13 99.27 2.55 13.10 18.00 14 101.79 2.17 13.40 21.00 15100.72 2.43 12.70 18.90 16 99.71 2.31 12.70 16.80 17 100.94 2.58 13.1023.30 18 100.78 2.43 12.40 16.00 19 95.82 2.49 12.40 18.60 20 100.702.66 12.60 20.60 MIN 95.82 2.17 12.40 16.00 MAX 102.04 2.66 13.40 24.60AVE 100.61 2.42 12.84 19.67

Embodiment 6

A method for manufacturing capacitors is as follows:

(1) Using a JCC anodized foil whose model is 110LJB22B-33VF-58.4 μF,where the JCC anodized foil is 17 mm in width and 391 mm in length;using a Nanofoil cathode foil whose model is NF3000, where the Nanofoilcathode foil is 17 mm in width and 421 mm in length; and electrolyticpaper is NKK,RTZ3040 that is 20 mm in width. Specifications ofmanufactured capacitors are 16V3300 μF and the size of the capacitors isΦ16*26 mm. Winding the electrolytic paper between the anodized foil andthe cathode foil into a capacitor core, welding an anode of thecapacitor core onto an iron bar, and impregnating the capacitor core ina forming agent. According to a voltage of a positive foil, applying a365V voltage in a phosphoric acid forming agent for 20 minutes. Afterthe chemical treatment, impregnating the capacitor core in 70° C. purewater for 30 minutes to remove residual ingredients in the formingagent, then drying the capacitor core in a low-temperature of 75° C.drying for 60 minutes, and then drying it in a high temperature of 150°C. for 30 minutes.

(2) Impregnating the dried capacitor core in a dispersion A for 15minutes.

(3) Removing the capacitor core out of the dispersion A, creating avacuum to reach an 850 Pa vacuum state and then impregnating thecapacitor core in the dispersion A for 5 minutes; and taking thecapacitor core out, placing it in a low temperature of 85° C. and dryingit for 60 minutes.

(4) Impregnating the capacitor core in the dispersion A, breaking thevacuum and then feeding compressed air until 0.5 MPa, and keeping itimpregnated for 5 minutes; and taking the capacitor core out, placing itin a low temperature of 85° C. and drying it for 60 minutes.

(5) Impregnating the capacitor core in the dispersion A, performingpressurization to an atmospheric pressure, and keeping the pressurizedstate for 5 minutes; taking the capacitor core out, placing thecapacitor core in a low temperature of 85° C. and drying it for 60minutes, then placing the capacitor core in a high temperature of 150°C. and drying it for 30 minutes, and taking the capacitor core out.

(6) Repeating steps (3) to (5) five times.

(7) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor. An agingmethod is: Placing the product in a 110° C. environment, applying a 0.2×rated voltage for 80 minutes, then applying a 0.5× rated voltage for 60minutes, then applying a 0.8× rated voltage for 40 minutes, thenapplying a 1.0× rated voltage for 20 minutes, and then applying a 1.2×rated voltage for 20 minutes.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 6.

TABLE 6 Performance test for capacitors manufactured in Embodiment 6Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 3305.1 2.1011.40 25.30 2 3307.2 2.13 11.70 26.00 3 3300.8 2.12 11.60 26.50 4 3305.12.21 12.0 29.10 5 3309.2 2.22 12.20 31.30 6 3301.1 2.12 11.90 22.00 73305.2 2.22 12.10 23.30 8 3301.2 2.23 12.10 25.00 9 3304.1 2.22 12..1025.00 10 3305.2 2.21 11.70 22.00 11 3302.1 2.23 11.80 37.00 12 3308.22.12 11.60 25.00 13 3310.3 2.18 11.40 28.00 14 3300.9 2.09 11.60 28.2015 3302.4 2.22 11.40 21.70 16 3302.5 2.12 11.40 24.00 17 3308.2 2.3311.60 25.10 18 3309.1 2.23 11.80 23.00 19 3310.2 2.13 11.70 29.30 203309.7 2.19 11.90 38.60 MIN 3300.8 2.09 11.40 21.70 MAX 3310.3 2.3312.20 38.60 AVE 3305.1 2.18 11.70 26.77

Embodiment 7

Similar to Embodiment 5, this embodiment intends to manufacture 20capacitors and analyze them. A difference between the manufacturingmethod in Embodiment 5 and this embodiment is that a JCC anodized foil(model: HGF110J16-365VF-1.33 μF; width: 7.5 mm; length: 192 mm) and aNanofoil cathode foil (model: NF3000; width: 7.5 mm; length: 212 mm) areused, and electrolytic paper whose width is 15 mm and whose model isAsahi Kasel ADS040060 is wound between the anodized foil and the cathodefoil into a capacitor core, so that capacitors are made, whosespecifications are 200V15 uF and whose size is Φ10*12 mm. An analysisresult of the capacitors is shown in Table 7.

TABLE 7 Performance test for capacitors manufactured in Embodiment 7Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 15.73 2.7431.60 1.50 2 15.22 2.90 25.90 1.50 3 15.84 2.49 30.00 1.40 4 15.73 2.6625.10 1.30 5 15.49 2.88 26.10 1.20 6 15.51 2.74 27.10 1.20 7 15.62 2.5826.30 1.20 8 15.50 2.48 25.90 1.20 9 15.57 2.49 26.50 1.20 10 15.60 2.7129.70 1.20 11 15.54 2.79 22.00 1.30 12 14.98 2.30 28.30 1.00 13 15.572.96 31.20 1.20 14 15.53 2.82 27.30 1.10 15 15.33 2.96 26.40 1.20 1615.33 2.97 25.60 1.20 17 15.48 2.63 23.70 1.40 18 15.39 2.49 23.60 1.1019 15.36 2.70 23.40 1.30 20 15.42 2.78 24.30 1.30 MIN 14.98 2.30 22.001.00 MAX 15.84 2.97 31.60 1.50 AVE 15.49 2.70 26.50 1.25

Embodiment 8

Similar to Embodiment 5, this embodiment intends to manufacture 20capacitors and analyze them. A difference between the manufacturingmethod in Embodiment 5 and this embodiment is that a JCC anodized foil(model: HGF110J16-365VF-1.33 μF; width: 13 mm; length: 302 mm) and aNanofoil cathode foil (model: NF3000; width: 13 mm; length: 327 mm) areused, and electrolytic paper whose width is 15 mm and whose model isAsahi Kasel ADS040060 is wound between the anodized foil and the cathodefoil into a capacitor core, so that capacitors are made, whosespecifications are 200V47 uF and whose size is Φ13*20 mm. An analysisresult of the capacitors is shown in Table 8.

TABLE 8 Performance test for capacitors manufactured in Embodiment 8Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 46.74 3.3017.90 13.20 2 47.07 3.38 18.10 7.40 3 46.99 3.22 17.80 6.90 4 47.11 2.9116.90 9.10 5 47.21 3.01 16.60 13.90 6 46.52 2.74 17.20 8.80 7 47.66 2.8818.30 6.50 8 45.65 2.59 17.60 6.70 9 47.66 2.80 16.70 13.80 10 46.633.00 17.50 7.90 11 46.98 3.40 17.50 11.70 12 45.78 3.40 17.80 7.80 1346.80 3.00 17.30 11.10 14 46.90 3.00 17.00 6.20 15 46.29 3.20 18.30 7.5016 45.74 2.60 17.60 8.70 17 46.05 2.80 16.60 18.20 18 46.16 2.60 18.005.90 19 46.28 2.60 17.40 7.40 20 47.00 2.97 18.10 18.00 MIN 45.65 2.5916.60 5.90 MAX 47.66 3.40 18.30 18.20 AVE 46.66 2.97 17.51 9.84

Embodiment 9

Similar to Embodiment 5, this embodiment intends to manufacture 20capacitors and analyze them. Specifications of the manufacturedcapacitors are 200V100 μF and the size of the capacitors is Φ16*26 mm. Adifference between the manufacturing method in Embodiment 5 and thisembodiment is that a particle size of a conductive polymer used in thisembodiment is 30˜50 nm. An analysis result of the capacitors is shown inTable 9.

TABLE 9 Performance test for capacitors manufactured in Embodiment 9Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 102.13 1.7819.70 19.00 2 103.50 1.83 21.10 16.00 3 102.25 1.73 19.90 16.50 4 103.571.72 20.30 16.10 5 103.00 1.64 18.70 16.00 6 102.90 1.80 20.10 16.70 7103.81 1.63 18.65 16.00 8 102.25 1.83 20.60 18.40 9 102.55 1.70 20.6014.00 10 101.49 1.64 18.30 14.00 11 101.76 2.01 19.30 19.00 12 102.982.03 19.42 14.00 13 102.65 1.91 19.70 11.00 14 101.31 1.89 18.71 12.0015 103.44 1.82 20.80 16.20 16 103.27 1.96 21.60 17.00 17 103.26 1.8617.50 17.00 18 102.70 1.92 20.10 11.60 19 103.01 1.86 20.40 18.00 20102.98 1.77 19.50 13.70 MIN 101.31 1.63 17.50 11.00 MAX 103.81 2.0321.60 19.00 AVE 102.74 1.82 19.75 15.61

Embodiment 10

Similar to Embodiment 5, this embodiment intends to manufacture 20capacitors and analyze them. Specifications of the manufacturedcapacitors are 200V100 μF and the size of the capacitors is Φ16*26 mm. Adifference between the manufacturing method in Embodiment 5 and thisembodiment is that a particle size of a conductive polymer used in thisembodiment is 70˜90 nm. An analysis result of the capacitors is shown inTable 10.

TABLE 10 Performance test for capacitors manufactured in Embodiment 10Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 102.21 1.6220.00 5.80 2 101.82 1.91 19.80 4.80 3 101.68 1.78 20.70 4.20 4 102.101.80 18.90 6.20 5 102.94 1.93 18.10 5.50 6 102.64 1.74 19.60 5.80 7102.75 2.03 21.60 4.80 8 101.52 1.77 18.90 6.20 9 102.57 1.87 18.20 6.0010 102.91 2.18 17.20 6.00 11 100.16 1.75 19.70 4.60 12 101.70 1.89 18.904.20 13 101.91 2.01 19.40 6.90 14 101.77 2.11 18.90 5.90 15 101.39 1.7418.80 4.70 16 100.44 1.86 19.60 4.50 17 100.25 1.85 20.50 5.90 18 102.522.22 18.60 4.20 19 103.01 1.85 19.00 7.30 20 102.58 2.21 21.50 4.60 MIN100.16 1.62 17.20 4.20 MAX 103.01 2.22 21.60 7.30 AVE 101.94 1.91 19.405.41

Embodiment 11

A solid electrolyte used in this embodiment is a mixture of a conductivepolymer and a conductive carbon material. The conductive polymer is poly(3,4-ethylene dioxythiophene) whose particle size is about 40˜80 nm,preferably 60 nm. The conductive carbon material is graphene whoseaverage particle size is 150 nm. A dispersion B is prepared by mixingthe poly (3,4-ethylene dioxythiophene) and the graphene at a weightpercentage of 1:1, in which concentrations of the graphene and the poly(3,4-ethylene dioxythiophene) are weight percentages 3% and 3%respectively. A method for manufacturing capacitors is as follows:

(1) Using a JCC anodized foil whose model is HGF110J16˜365VF-1.33 μF,where the JCC anodized foil is 17 mm in width and 491 mm in length;using a Nanofoil cathode foil whose model is NF3000, where the Nanofoilcathode foil is 17 mm in width and 521 mm in length; and electrolyticpaper is Asahi Kasel ADS040060 that is 20 mm in width. Specifications ofmanufactured capacitors are 200V100 μF and the size of the capacitors isΦ16*26 mm. Winding the electrolytic paper between the anodized foil andthe cathode foil into a capacitor core, welding an anode of thecapacitor core onto an iron bar, and impregnating the capacitor core ina forming agent. According to a voltage of a positive foil, applying a365V voltage in a phosphoric acid forming agent for 20 minutes. Afterthe chemical treatment, impregnating the capacitor core in 40° C. purewater for 30 minutes to remove residual ingredients in the formingagent, then drying the capacitor core in a low-temperature of 50° C.drying for 20 minutes, and then drying it in a high temperature of 160°C. for 20 minutes.

(2) Impregnating the dried capacitor core in a dispersion B for 1minute.

(3) Removing the capacitor core out of the dispersion B, creating avacuum to reach a 700 Pa vacuum state and then impregnating thecapacitor core in the dispersion B for 5 minutes.

(4) Keeping the capacitor core in the dispersion B, breaking the vacuumand then feeding compressed air until 0.4 MPa, and keeping thepressurized state for 5 minutes.

(5) Keeping the capacitor core in the dispersion B, performingdepressurization to an atmospheric pressure state, and keeping theatmospheric pressure state for 5 minutes.

(6) Taking the capacitor core out, placing the capacitor core in a lowtemperature of 65° C. and drying it for 60 minutes, then placing thecapacitor core in a high temperature of 150° C. and drying it for 40minutes, and taking the capacitor core out.

(7) Repeating steps (3) to (6) eight times.

(8) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 11.

TABLE 11 Performance test for capacitors manufactured in Embodiment 1Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 101.02 2.2010.90 25.00 2 100.01 2.35 10.40 27.40 3 101.64 2.36 10.40 26.00 4 101.232.33 10.30 25.50 5 101.23 2.21 10.20 22.40 6 100.05 2.47 10.30 18.90 7101.27 2.43 10.50 16.90 8 101.32 2.41 10.20 19.80 9 101.21 2.23 10.1020.50 10 100.34 2.22 10.40 21.20 11 101.81 2.21 10.20 18.90 12 101.032.36 10.60 18.20 13 100.08 2.28 10.90 17.90 14 101.69 2.27 11.10 22.8015 100.23 2.33 10.80 19.20 16 100.07 2.23 10.20 19.80 17 100.32 2.3410.50 15.10 18 100.11 2.32 10.20 16.10 19 102.01 2.35 10.30 16.70 20100.23 2.34 10.50 18.30 MIN 100 2.2 10.10 15.10 MAX 102 2.47 11.10 27.40AVE 100.8 2.312 10.45 20.33

Embodiment 12

In this embodiment, a conductive polymer is poly (3,4-ethylenedioxythiophene) whose particle size is about 40˜80 nm, preferably 60 nm,and a conductive carbon material is a carbon nanotube whose averagelength is 150 nm; a dispersion A and a dispersion C are prepared, andconcentrations of the carbon nanotube and the poly (3,4-ethylenedioxythiophene) are weight percentages 5% and 2% respectively. A methodfor manufacturing capacitors is as follows:

(1) Using a JCC anodized foil whose model is HGF110J16˜365VF-1.33 μF,where the JCC anodized foil is 17 mm in width and 491 mm in length;using a Nanofoil cathode foil whose model is NF3000, where the Nanofoilcathode foil is 17 mm in width and 521 mm in length; and electrolyticpaper is Asahi Kasel ADS040060 that is 20 mm in width. Specifications ofmanufactured capacitors are 200V100 μF. and the size of the capacitorsis Φ16*26 mm. Winding the electrolytic paper between the anodized foiland the cathode foil into a capacitor core, welding an anode of thecapacitor core onto an iron bar, and impregnating the capacitor core ina forming agent. According to a voltage of a positive foil, applying a365V voltage to perform chemical treatment in a phosphoric acid formingagent for 20 minutes. After the chemical treatment, impregnating thecapacitor core in 40° C. pure water for 30 minutes to remove residualingredients in the forming agent, then drying the capacitor core in alow-temperature of 50° C. drying for 20 minutes, and then drying it in ahigh temperature of 160° C. for 20 minutes.

(2) Impregnating the dried capacitor core in a dispersion A for 15minutes.

(3) Removing the capacitor core out of the dispersion A, creating avacuum to reach an 850 Pa vacuum state and then impregnating thecapacitor core in the dispersion B for 10 minutes.

(4) Keeping the capacitor core in the dispersion A, breaking the vacuumand then feeding compressed air until 0.1 MPa, and keeping thepressurized state for 1 minute.

(5) Keeping the capacitor core in the dispersion A, performingpressurization to an atmospheric pressure, and keeping the pressurizedstate for 10 minutes; taking the capacitor core out, placing thecapacitor core in low temperature of 85° C. and drying it for 40minutes, then placing the capacitor core in a high temperature of 110°C. and drying it for 60 minutes, and taking the capacitor core out.

(6) Impregnating the dried capacitor core in the dispersion C, andkeeping it impregnated for 5 minutes; taking the capacitor core out,placing the capacitor core in a low temperature of 85° C. and drying itfor 20 minutes, then placing the capacitor core in a high temperature of165° C. and drying it for 20 minutes, and taking the capacitor core out.

(7) Repeating steps (3) to (8) five times.

(8) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 1.

TABLE 12 Performance test for capacitors manufactured in Embodiment 12Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 101.02 2.2010.80 23.00 2 100.32 2.23 10.30 18.90 3 100.66 2.21 10.30 20.30 4 101.292.09 10.50 20.60 5 101.23 2.45 10.20 21.30 6 100.32 2.23 10.50 22.30 7101.24 2.62 10.40 21.50 8 101.35 2.42 9.80 19.30 9 101.23 2.41 10.3018.20 10 100.83 2.40 10.20 19.20 11 100.89 2.34 10.40 20.50 12 101.022.43 10.20 18.10 13 100.21 2.23 10.40 19.70 14 100.78 2.22 10.20 20.5015 100.32 2.23 10.40 19.40 16 100.32 2.30 10.20 18.70 17 100.54 2.3210.10 19.50 18 101.34 2.33 10.10 20.50 19 100.33 2.29 10.00 23.10 20100.41 2.35 10.20 22.60 MIN 100.2 2.09 9.80 18.10 MAX 101.4 2.62 10.8023.10 AVE 100.8 2.315 10.28 20.36

Embodiment 13

In this embodiment, a conductive polymer is poly (3,4-ethylenedioxythiophene) whose particle size is about 40˜80 nm, preferably 60 nm,and a conductive carbon material is a carbon nanotube whose average sizeis 100 nm; a dispersion A and a dispersion C are prepared, andconcentrations of the carbon nanotube and the poly (3,4-ethylenedioxythiophene) are weight percentages 0.5% and 2.5% respectively. Amethod for manufacturing capacitors is as follows:

(1) Using a JCC anodized foil whose model is HGF110J16˜365VF-1.33 μF,where the JCC anodized foil is 17 mm in width and 491 mm in length;using a Nanofoil cathode foil whose model is NF3000, where the Nanofoilcathode foil is 17 mm in width and 521 mm in length; and electrolyticpaper is Asahi Kasel ADS040060 that is 20 mm in width. Specifications ofmanufactured capacitors are 200V100 μF and the size of the capacitors isΦ16*26 mm. Winding the electrolytic paper between the anodized foil andthe cathode foil into a capacitor core, welding an anode of thecapacitor core onto an iron bar, and impregnating the capacitor core ina forming agent. According to a voltage of a positive foil, applying a365V voltage in a phosphoric acid forming agent for 20 minutes. Afterthe chemical treatment, impregnating the capacitor core in 40° C. purewater for 30 minutes to remove residual ingredients in the formingagent, then drying the capacitor core in a low-temperature of 50° C.drying for 20 minutes, and then drying it in a high temperature of 160°C. for 20 minutes.

(2) Impregnating the dried capacitor core in a dispersion C for 30minutes.

(3) Taking the capacitor core out, placing the capacitor core in a lowtemperature of 85° C. and drying it for 60 minutes, and then placing thecapacitor core in a high temperature of 150° C. and drying it for 30minutes.

(4) Impregnating the dried capacitor core in a dispersion A for 15minutes.

(5) Removing the capacitor core out of the dispersion A, creating avacuum to reach a 970 Pa vacuum state and then impregnating thecapacitor core in the dispersion B for 8 minutes.

(6) Keeping the capacitor core in the dispersion A, breaking the vacuumand then feeding compressed air until 0.6 MPa, and keeping thepressurized state for 10 minutes.

(7) Keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure state, and keeping theatmospheric pressure state for 1 minute.

(8) Taking the capacitor core out, placing the capacitor core in a lowtemperature of 100° C. and drying it for 20 minutes, and then placingthe capacitor core in a high temperature of 135° C. and drying it for 60minutes.

(9) Repeating steps (4) to (8) five times.

(10) Putting the capacitor core in an aluminum cover, sealing thecapacitor core with a rubber plug, and performing aging treatment toobtain a solid electrolyte aluminum-electrolytic capacitor.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 13.

TABLE 13 Performance test for capacitors manufactured in Embodiment 13Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min 1 101.05 2.2610.30 21.20 2 100.72 2.26 10.30 18.90 3 100.31 2.28 10.10 18.90 4 101.542.29 10.20 20.60 5 101.45 2.46 10.80 21.10 6 100.39 2.32 10.20 22.10 7101.48 2.41 10.30 21.20 8 101.47 2.45 10.10 20.10 9 101.44 2.41 10.1019.80 10 100.45 2.48 10.10 19.20 11 100.98 2.44 10.20 20.20 12 101.222.46 10.10 18.20 13 100.25 2.26 10.20 20.20 14 100.88 2.26 10.20 20.3015 100.39 2.28 10.20 19.40 16 100.38 2.21 10.20 20.10 17 100.55 2.2310.40 19.50 18 101.38 2.18 10.60 25.30 19 100.45 2.20 10.10 20.30 20100.58 2.28 10.30 20.40 MIN 100.25 2.18 10.10 18.20 MAX 101.54 2.4810.80 25.30 AVE 100.87 2.32 10.30 20.40

Comparative Embodiment 1

Similar to Embodiment 1, this comparative embodiment intends tomanufacture 20 capacitors and analyze them. Specifications of thecapacitors are 200V100 μF and the size of the capacitors is Φ16*26 mm. Adifference between the manufacturing method in Embodiment 1 and thiscomparative embodiment is that step (3) is deleted and steps (2) to (4)are repeated five times. An analysis result of the capacitors is shownin Table 14.

TABLE 14 Performance test for capacitors manufactured in ComparativeEmbodiment 1 Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min1 63.75 7.85 32.15 144.40 2 59.87 7.37 30.22 38.00 3 71.52 6.41 28.8953.00 4 59.37 8.60 41.37 129.00 5 60.15 7.14 35.11 56.00 6 59.48 9.9836.74 52.00 7 59.47 9.41 40.05 47.00 8 60.12 6.56 31.03 20.00 9 59.848.35 33.71 142.00 10 60.11 8.34 33.76 19.00 11 60.22 7.68 37.95 148.0012 60.14 7.59 44.86 84.00 13 59.96 7.62 39.19 128.00 14 60.49 6.56 36.63105.00 15 60.15 8.78 34.91 19.00 16 59.71 7.93 47.57 98.00 17 59.34 8.0538.25 42.00 18 59.99 8.58 34.61 111.00 19 60.32 7.32 32.66 121.00 2059.63 9.22 32.34 71.00 MIN 59.34 6.41 28.89 19.00 MAX 71.52 9.98 47.57148.00 AVE 60.68 7.97 36.10 81.37

Comparative Embodiment 2

Similar to Embodiment 1, this comparative embodiment intends tomanufacture 20 capacitors and analyze them. Specifications of thecapacitors are 200V100 μF and the size of the capacitors is Φ1:016*26mm. A difference between the manufacturing method in Embodiment 1 andthis comparative embodiment is that steps (3) and (5) are deleted and animpregnation time in step (2) is 30 minutes. An analysis result of thecapacitors is shown in Table 15.

TABLE 15 Performance test for capacitors manufactured in ComparativeEmbodiment 2 Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min1 80.54 6.28 28.40 116.00 2 80.16 6.68 37.50 37.00 3 82.64 6.49 28.2027.00 4 80.13 5.92 22.00 53.00 5 79.43 6.30 29.00 128.00 6 79.21 6.4428.00 70.00 7 81.63 6.10 21.00 112.00 8 81.89 6.01 27.50 46.00 9 81.055.79 18.00 53.00 10 81.55 5.85 32.90 34.00 11 82.43 5.60 23.40 70.00 1281.38 5.73 27.90 112.00 13 82.27 6.33 22.70 23.00 14 82.34 5.63 19.4031.00 15 78.72 5.94 32.40 76.00 16 80.04 5.59 30.20 36.00 17 80.23 5.7921.70 68.00 18 79.41 5.86 25.40 43.00 19 80.32 6.09 25.90 94.00 20 81.745.91 18.30 26.00 MIN 78.72 5.59 18.00 23.00 MAX 82.64 6.68 37.50 128.00AVE 80.86 6.02 25.99 62.75

Comparative Embodiment 3

Specifications of capacitors are 16V 3300uF 18*36.5 mm, and a detailedmethod for manufacturing the capacitors is as follows:

(1) Winding electrolytic paper between an anodized aluminum foil and acathode foil into a capacitor core.

(2) Welding the capacitor core onto an iron bar, and impregnating it ina forming agent to make the forming agent just submerge the capacitorcore. Applying a 32V voltage, and performing chemical repair treatmentfor the two anodized aluminum foils simultaneously for 10 minutes.

(3) Perform carbonization treatment on the capacitor core for 20 minutesat a temperature of 300±10° C.

(4) Repeating steps (2) and (3) four times.

(5) Placing the capacitor core into monomers separately forimpregnating. The impregnation continues for 6 minutes during which atleast ⅔ of the capacitor core is under a liquid level of an impregnatingfluid. After completion of the impregnation, removing the solvent.

(6) Placing the capacitor core in an oxidant for impregnating. Duringthe impregnation, the capacitor core is fully under the liquid level ofthe impregnating fluid. An impregnation method is: Impregnating thecapacitor core, inside which an atmospheric pressure exists, in theoxidant for 2 minutes, and then taking the capacitor core out of theoxidant, creating a vacuum to reach a vacuum degree lower than 90 KPa,and keeping this state for 2 minutes, whereupon depressurization isperformed to an atmospheric pressure. Feeding compressed air until thepressure is 3 atm, and impregnating the capacitor core in the oxidantfor 5 minutes, whereupon the impregnation is completed.

(7) Performing two sections of polymerization on the impregnatedcapacitor core: First, performing low-temperature polymerization for200±10 minutes at a polymerization temperature of 50±10° C.; and thenperforming high-temperature polymerization for 100±10 minutes at apolymerization temperature of 150±10° C.

(8) Aging treatment and test sorting: Applying a 0.5× rated voltage, a1× rated voltage, and a 1.2× rated voltage to one electrode of eachcapacitor separately to perform aging treatment, and then applying 0.5×rated voltage, a 1× rated voltage, and a 1.2× rated voltage to the otherelectrode of the capacitor separately to perform aging treatment.

After the aging is completed, 20 capacitors are taken as samples fortesting. On average, CAP(uF) is 3312, DF (%) is 3.3, ESR(mΩ)/100 kHz is6.3, and LC(uA)/1 min is 153.

This comparative embodiment uses a solvent-based solvent used as amonomer and an oxidant. In the impregnation process, surface tension ofthe solvent is small, the solvent can penetrate into pores of the formedfoil, and conductive polymers are generated in the pores. In the pores,there are many defects on an oxide film, and the conductive polymersexist, thereby causing a high leakage current. In addition, theconductive polymers are hardly repairable. Therefore, after the highleakage current is generated, a short circuit may occur, and it isdifficult to increase the voltage of the product.

Comparative Embodiment 4

An anodized foil, a cathode foil, and electrolytic paper andspecifications thereof, which are used in a capacitor manufacturingmethod in this comparative embodiment are the same as those inEmbodiment 5. Specifications of manufactured capacitors are 200V100 μF,and the size of the capacitors is Φ16*26 mm. The detailed manufacturingmethod is as follows:

(1) Winding electrolytic paper between an anodized aluminum foil and acathode foil into a capacitor core.

(2) Placing the capacitor core in a temperature of 300° C. forcarbonization treatment, and removing ash content; then placing thecapacitor core in a 7% ammonium adipate solution, and applying a 9Vvoltage for 15 minutes for repairing the damaged oxide film.

(3) Making the oxidant P-toluenesulfonic acid iron into a 40˜60% alcoholsolution, impregnating the capacitor core treated in step (2) into thealcohol solution for 3˜6 minutes, taking the capacitor core out anddrying it in a temperature of 60˜70° C. to remove the alcohol solution.

(4) Making the monomer (3,4-ethylene dioxythiophene) into a 40˜55%alcohol solution, impregnating the capacitor core, which has beenimpregnated in the oxidant and dried, in the alcohol solution of themonomer for 2˜4 minutes. Taking the capacitor core out and drying it ina temperature of 60˜70° C. to remove the alcohol solution. Raising thetemperature to 110˜120° C. to trigger a polymerization reaction and forma polymer conductive layer.

(5) Sealing the capacitor core with sealing rubber and placing it in analuminum cover. Applying an aging voltage for 100 minutes to obtain asolid electrolyte aluminum-electrolytic capacitor.

After completion of the aging, 20 samples are taken for testing, theresult of which is shown in Table 16.

TABLE 16 Performance test for capacitors manufactured in ComparativeEmbodiment 4 Serial ESR (mΩ)/ No. CAP (uF) DF (%) 100 kHz LC (uA)/1 min1 96.60 2.93 45.80 — 2 96.69 3.39 48.40 — 3 98.24 3.28 48.90 — 4 97.062.16 38.00 — 5 95.52 3.39 48.50 — 6 95.68 2.77 48.70 — 7 98.22 2.7046.50 — 8 98.45 2.72 48.37 — 9 95.12 2.79 48.70 — 10 95.45 2.75 48.40 —11 96.80 2.91 46.80 — 12 97.47 2.39 48.70 — 13 95.58 3.47 45.80 — 1497.11 3.02 47.80 — 15 95.49 2.74 47.50 — 16 95.32 3.59 48.20 — 17 96.682.71 48.70 — 18 96.01 2.27 48.60 — 19 96.47 2.89 48.60 — 20 96.37 2.5648.20 — MIN 95.12 2.16 38.00 — MAX 98.45 3.59 48.90 — AVE 96.52 2.8747.46 —

Note: Because the withstand voltage of the product manufactured in themethod in Comparative Embodiment 4 is deficient, the aging treatmentcannot be performed, and the leakage current cannot be tested.

According to the embodiments and the comparative embodiments, in thepresent invention, when the capacitor core is impregnated in thedispersion A under multiple pressure conditions such as atmosphericpressure, vacuum and pressurization, the electrolyte in the dispersion Acan more sufficiently generate a stable conductive polymer layer on thesurface of the foil, thereby improving electrical performance of thecapacitor. In addition, as a solid electrolyte, the polymer dispersion Acan effectively increase the withstand voltage of the solid electrolytealuminum-electrolytic capacitor. The impregnation steps are repeatedmany times, and by means of heat treatment, the impregnating solvent isremoved out of the capacitor core, which is conducive to absorption ofan impregnating fluid in next impregnation. In this way, a high-voltagesolid electrolyte aluminum-electrolytic capacitor of a lower ESR valuecan be obtained, the capacitance withdrawing rate is improved, andproduct consistency is improved while loss is reduced. Especially in a(vacuum impregnation+low temperature drying)→(pressurizedimpregnation+low temperature drying)→(atmospheric pressureimpregnation+low temperature drying+high temperature drying) cyclicimpregnation process, the conductive polymer in the impregnating fluidcan be better absorbed next time, the ESR of the manufactured capacitoris lower, the capacitor core can be impregnated more thoroughly, and astable conductive polymer layer can be obtained.

In manufacturing the capacitors, the impregnation is performed in avacuum state in order to extract air out of the electrolytic paper, thefoil surface, and the foil pores, vacate space for adsorption of thedispersion A, and adsorb more of the dispersion A. If bubbles exist onthe foil surface, the bubbles prevent adsorption of the dispersion A andaffect integrity of a film that is formed by the dispersion A on thefoil surface after drying, thereby affecting product performance. Inaddition, the vacuum can take away the bubbles in the dispersion A,thereby improving a permeation effect of the dispersion A.

After being impregnated in the vacuum, the capacitor core enters anatmospheric pressure state. Therefore, by virtue of air pressure, thecapacitor core impregnated in the dispersion A is further permeatedunder an atmospheric pressure. The principles of pressurization are thesame. That is, relative to the vacuum, a greater pressure differenceexists, so that the capacitor core impregnated in the dispersion A isimpregnated more thoroughly, and more of the dispersion A is adsorbed.

Different pressures are generated under the three different pressurestates: vacuum, atmospheric pressure, and pressurization. With thepressure increased gradually, the capacitor core is impregnated morethoroughly.

For large-sized capacitors such as Φ16*26, because the capacitor core islarger, the dispersion A passes through a longer path and penetrates thecapacitor core more difficulty, and it is difficult to accomplish theimpregnation effect of the capacitor core if the pressure condition ismerely a combination of the vacuum and the atmospheric pressure or acombination of pressurization and the atmospheric pressure, which alsoaffects product performance to some extent.

In Embodiment 11, Embodiment 12, and Embodiment 13, a carbon material ofhigher conductivity is added in the conductive polymer electrolyte toincrease electrical conductivity of the conductive polymer. After theelectrical conductivity of the solid electrolyte is increased, theequivalent series resistance (ESR) of the product is decreased directly,and the product loss is reduced to some extent. Products may slightlyvary with different adding conditions such as concentration andimpregnation order, and optimization may be performed by means ofrepeated tests. From Embodiment 5, it can be seen that for lack of acarbon material used for increasing electrical conductivity, theequivalent series resistance is higher, and the loss is slightlyincreased.

To accomplish optimum performance of the solid electrolytealuminum-electrolytic capacitor, the present invention provides processoptimization and improvement, which is described below with reference toan orthogonal optimization experiment. The orthogonal optimizationexperiment includes 7 factors and 3 levels, and is carried out 18 times.After the aging, 20 samples were taken for testing, and test resultswere averaged. See Table 17 for details.

TABLE 17 Factors, levels and performance test in orthogonal optimizationexperiment Vacuum Pres- Low High impreg- surization- temperaturetemperature Vacuum nation impregnation drying- drying- RepeatPerformance test degree/ time/ Pressure/ time/ time/ time/ times/ ESR(mΩ)/ LC(uA)/ pa min MPa min min min times CAP (uF) DF (%) 100 kHz 1 minEmbodiment 14 700 1 0.3 1 30 10 3 46.34 7.23 51.19 1.56 Embodiment 15700 5 0.5 5 60 30 5 69.53 8.11 34.37 14.33 Embodiment 16 700 10 0.8 1090 60 10 100.11 2.55 13.33 19.32 Embodiment 17 850 1 0.3 5 60 60 1081.30 6.22 26.97 10.23 Embodiment 18 850 5 0.5 10 90 10 3 100.14 2.7314.18 23.60 Embodiment 19 850 10 0.8 1 30 30 5 100.52 2.09 13.54 22.15Embodiment 20 900 1 0.5 1 90 30 10 84.54 6.09 23.78 15.60 Embodiment 21900 5 0.8 5 30 60 3 93.56 3.95 17.80 11.75 Embodiment 22 900 10 0.3 1060 10 5 96.63 2.95 16.13 15.40 Embodiment 23 700 1 0.8 10 60 30 3 92.844.66 16.83 7.10 Embodiment 24 700 5 0.3 1 90 60 5 70.63 6.74 28.11 6.82Embodiment 25 700 10 0.5 5 30 10 10 97.80 1.78 13.80 12.61 Embodiment 26850 1 0.5 10 30 60 5 93.44 4.03 16.76 17.05 Embodiment 27 850 5 0.8 1 6010 10 92.43 3.77 18.14 17.70 Embodiment 28 850 10 0.3 5 90 30 3 97.872.84 13.43 15.95 Embodiment 29 900 1 0.8 5 90 10 5 94.27 3.53 15.2013.56 Embodiment 30 900 5 0.3 10 30 30 10 98.50 2.73 13.59 14.46Embodiment 31 900 10 0.5 1 60 60 3 96.50 3.36 14.68 16.81

This orthogonal experiment is not orthogonality of all conditions, butseven major factors are selected for studying. An actual productionprocess may be determined according to a trade-off between performanceand efficiency, where the trade-off is achieved with reference toregularity shown in this table, actual production conditions andproduction efficiency.

From this orthogonal experiment, it can be seen that the vacuum degreeshould be moderate. If the vacuum degree is too low, air may be notexhausted thoroughly from the capacitor core, and adsorption of thedispersion A is impaired. If the vacuum degree is too high, moisture inthe dispersion A may be lost, a viscosity may increase, and the actualimpregnation effect may be affected. It is the same with the vacuumimpregnation time. If the impregnation time is too short, theimpregnation is not sufficient, and the impregnation effect can beimproved by increasing the impregnation time. However, if theimpregnation time is longer than a specific value, the improvement isnot obvious, and a too long impregnation time results in a highviscosity of the dispersion A and impairs the impregnation effect in anext cycle.

The increased impregnation pressure improves the impregnation effectsignificantly, and a longer pressurized impregnation time leads to ahigher impregnation effect. However, taking safety into account, thepressure stops increasing in a practicable range.

The purpose of low temperature drying is to discharge moisture in thedispersion out of the capacitor core slowly. A too high temperature thatleads to water boiling affects formation of a polymer film of thedispersion on the foil surface, and a too low temperature affects thespeed of discharge. A longer drying time improves the effect of moisturedischarge, but a too long drying time does not significantly increasethe effect but decreases production efficiency. The purpose of hightemperature drying is to further remove moisture out of the capacitorcore. Temperature selection is restricted by equipment. A proper hightemperature drying time should be selected. A too long drying timebrings no effect, but may impair the product.

Currently, because solid content of the dispersion is low, impregnationis performed repeatedly to increase the retained amount of polymers. Thetest results show that the effect of performance improvement is notobvious once the number of times of repeating the impregnation increasesto a specific value. The experiment is performed only with respect tothe current solid content of the dispersion. The number of times ofimpregnation varies with the solid content. The number of times ofimpregnation may be smaller if the solid content is higher.

The foregoing has described in detail a method for manufacturing ahigh-voltage solid electrolyte aluminum-electrolytic capacitor disclosedin the embodiments of the present invention. The principle andimplementation of the present invention are described herein throughspecific examples. The description about the embodiments of the presentinvention is merely provided to help understand the method and coreideas of the present invention. In addition, a person of ordinary skillin the art can make variations and modifications to the presentinvention in terms of the specific implementations and applicationscopes according to the ideas of the present invention. Therefore, thecontent of specification shall not be construed as a limitation on thepresent invention.

What is claimed is:
 1. A method for manufacturing a high-voltage solidelectrolyte aluminum-electrolytic capacitor, comprising: (1) welding acapacitor core of a capacitor onto an iron bar, applying a voltage forchemical treatment, and after the chemical treatment, washing and dryingthe capacitor core; (2) impregnating the dried capacitor core in adispersion A for 1˜30 minutes; (3) removing the capacitor core out ofthe dispersion A, creating a vacuum and then impregnating the capacitorcore in the dispersion A for 1˜10 minutes; (4) keeping the capacitorcore in the dispersion A, breaking the vacuum and then performingpressurization, and keeping the pressurized state for 1˜10 minutes; (5)keeping the capacitor core in the dispersion A, performingdepressurization to an atmospheric pressure, and keeping the atmosphericpressure for 1˜10 minutes; (6) taking the capacitor core out, placingthe capacitor core in a temperature of 65˜100° C. and drying it for20˜60 minutes, and then placing the capacitor core in a temperature of135˜165° C. and drying it for 20˜60 minutes; (7) repeating steps (3) to(6) at least once; (8) putting the capacitor core in an aluminum coverand sealing it, and performing aging treatment to obtain a high-voltagesolid electrolyte aluminum-electrolytic capacitor, wherein thedispersion A is a dispersion that comprises conductive polymers.
 2. Themethod for manufacturing a high-voltage solid electrolytealuminum-electrolytic capacitor according to claim 1, wherein a vacuumdegree of the vacuum created in step (3) is 700˜970 Pa.
 3. The methodfor manufacturing a high-voltage solid electrolyte aluminum-electrolyticcapacitor according to claim 1, wherein the pressurizing in step (4)refers to feeding compressed air until 0.1˜0.6 MPa.
 4. The method formanufacturing a high-voltage solid electrolyte aluminum-electrolyticcapacitor according to claim 1, wherein step (7) is to repeat steps (3)to (6) five times.
 5. The method for manufacturing a high-voltage solidelectrolyte aluminum-electrolytic capacitor according to claim 1,wherein the dispersion in step (2) is a polymer dispersion, and thepolymer dispersion is a poly (3,4-ethylene dioxythiophene).
 6. Themethod for manufacturing a high-voltage solid electrolytealuminum-electrolytic capacitor according to claim 1, wherein thecapacitor core in step (2) is formed by winding Asahi Kasel ADS040060electrolytic paper between a JCC anodized foil and a Nanofoil cathodefoil.
 7. The method for manufacturing a high-voltage solid electrolytealuminum-electrolytic capacitor according to claim 1, wherein themanufacturing method comprises: (1) welding the capacitor core of thecapacitor onto the iron bar, applying the voltage for chemicaltreatment, and after the chemical treatment, washing and drying thecapacitor core; (2) impregnating the dried capacitor core in thedispersion A for 15 minutes; (3) removing the capacitor core out of thedispersion A, creating a vacuum to reach an 850 Pa vacuum state and thenimpregnating the capacitor core in the dispersion A for 5 minutes; (4)keeping the capacitor core in the dispersion A, breaking the vacuum andthen feeding compressed air until 0.5 MPa, and keeping the pressurizedstate for 5 minutes; (5) keeping the capacitor core in the dispersion A,performing depressurization to the atmospheric pressure state, andkeeping the atmospheric pressure state for 5 minutes; (6) taking thecapacitor core out, placing the capacitor core in a low temperature of85° C. and drying it for 60 minutes, then placing the capacitor core ina high temperature of 150° C. and drying it for 30 minutes, and takingthe capacitor core out; (7) repeating steps (3) to (6) five times; (8)putting the capacitor core in an aluminum cover and sealing it, andperforming aging treatment to obtain a high-voltage solid electrolytealuminum-electrolytic capacitor, wherein the dispersion A is adispersion that comprises conductive polymers.
 8. The method formanufacturing a high-voltage solid electrolyte aluminum-electrolyticcapacitor according to claim 1, wherein the drying in step (1) isspecifically: drying the capacitor core in a low temperature of 50˜100°C. for 20˜100 minutes first, and then drying it in a high temperature of110˜200° C. for 20˜60 minutes.